* {
    padding: 0;
    margin: 0;
}
body{
    min-width: 320px;
    max-width: 750px;
    margin: 0 auto;
    box-sizing: border-box;
    background-color: #ebeef1;
}

@media screen and (min-width: 750px){
    html{
        font-size: 37.5px!important;
    }
}

.main {
    width: 100%;
    height: 100%;
}

.cover {
    position: relative;
    padding: 10px;
    width: 100%;
    height: 34rem;
    color: #fff;
    background-color: rgba(75, 134, 107, .8);
    h1 {
        position: absolute;
        top: 40%;
        left: 50%;
        transform: translate(-50%, -50%);
        font-size: 1.4rem;
    }
    .start {
        position: absolute;
        top: 60%;
        left: 50%;
        transform: translate(-50%, -50%);   
        padding: 0.4rem 1.2rem;
        background-color: #7c7e798e;
        border-radius: 20%;
        cursor: pointer;
    }
}